You can adjust the cable to the oil pump to allow less or more oil in to your mix but a true jet size is important imo, are you using the stock air box with snorkel or something else you should be able to get more then 40 mph just need to do a little more tuning fuel wise hows the is the cvt stuff looking and the pistion you might have weakened it with the engraving like that i brunt wholes in two different ones with out them be weakened
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